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  • Copac 
    Search the British Library, the National Library of Scotland, and university research libraries in the United Kingdom and Ireland.
  • CRL (Center for Research Libraries)
    Newspapers, journals, documents, archives, and other resources from a global network of sources. You can use RACER to request materials from CRL.
  • HathiTrust
    A partnership of academic and research institutions offering a collection of millions of titles digitized from libraries around the world.
  • Library of Congress Online Catalog
  • Lib-web-cats
    A directory of libraries throughout the world.
  • Repositories of Primary Sources
    A listing of over 4000 websites describing holdings of manuscripts, archives, rare books, historical photographs, and other primary sources, indexed by region.
  • WorldCat
    OCLC's catalogue of books and other materials in libraries worldwide.

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